Effect of Microstructure on the Heat Affected Zone Toughness of High Nitrogen Containing Ni-Free Austenitic Stainless Steel

摘要

This work was undertaken to examine the influence of Cr-nitride on impact property in heat-affected zone of high nitrogen containing Ni-free austenitic stainless steel. Cr-nitride precipitation of HAZ was simulated using the isothermal test and the Gleeble test by varying holding time and cooling rate, respectively. Impact toughness was determined by testing Charpy V-notch type impact specimens(55×10×5 mm)between room temperature and 77 K. Isothermal test results showed that the nose of each C curve(i.e., intergranular, cellular, and transgranular Cr-2N)was around 1173 K.